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Coil Current Draw Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the battery state of charge.
  2. Connect an ammeter (0 to 10 ampere scale selected) in series with the A/C clutch coil feed terminal using Back Probe Tool (special tool #6801, Terminal Probe). Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the A/C clutch coil.
  3. With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
  4. The A/C clutch should engage immediately and the clutch coil supply voltage should be within two volts of the battery voltage. If the clutch coil supply voltage is OK, go to Step  5 . If the coil supply voltage is not within two volts of battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as necessary.
  5. See A/C CLUTCH COIL SPECIFICATIONS  for acceptable A/C clutch coil current draw. Specifications apply for a work area temperature of 21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts.
    1. If the A/C clutch coil current reading is zero, the coil is open and must be replaced.
    2. If the A/C clutch coil current reading is above specifications, the coil is shorted and must be replaced.
A/C CLUTCH COIL SPECIFICATIONS

Coil Resistance Coil Current Draw
3.6 ± 0.2 ohms 3.2 - 3.3 amps @ 12V ± 0.5V @ 21° C (70° F)
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